Dynamo-electric machine.



V. G. APPLE. DYNAMO ELECTRIC MACHINE.

' APPLIOATION FILED APR. 5, 1910.

1,031,316, Patented July 2,1912.

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v de a machine which'is notjonly cheaper in ring, showing the assembled pole shoes used UNITED STATES PATENT OFFICE.

Specification of Letters Patent. Patented J lily 2, 1912... Application filed April 5, 1910. Serial No. 553,650. I

To all whom it mag concern:

Be it known that I, VINCENT G. APPLE, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new -and useful Improvements iii'Dyna-mo-Electrio Macnines, of whicli-tiieiollowing is a specification;

llly invention relates to improvements in dynamo electric machines, and has for-its general object to ixnproue the structure-of dynamo'el-ectri c machines, and especially to redu iz'e the in the: assemblage of the partsfin theIcoiist-ructionpf such machines.

Anotherobje'ct of my invention is to pro- .together, in of the field machines are made, in pole shoes become an magnetic poles of the structures the operation of assemblage but which is very efficient and which, owing to the character of its structure, will remain cool during continued operation under heavy load.

Other and further objects of my invention will become apparent to persons skilled in the art from a consideration of the following description taken in conjunction with the drawings, wherein-5 igure" 1 is aside elevation of my improved dynamo-electric machine, showing parts in section; Fig.'2 is a central vertical cross sectional view, with the armature removed; Fig. 3 is a View of a composite pole in which they are to also expensive.

vention, I attain v pletely laminated tendant with low other mechanical advantages, the field coils of mymachine being held in their respective By the practice of my inthe advantages of a compole face structure, at-

assemblage and location of the and quickly accomplished.

10 indicates generally the frame of a dynamo electric machine, provided, in this illustrative exemplification, with four magnetic poles 11, 12, 13, and 14. The metal intermediate of the poles, together with the for a quadrupolar dynamo in a separate structure Fig. 4 is a view of a single lamina or plate, a number of which a a used to constitute a pole shoe or terminal; 3 one of the field poles of the field magnet; Fig. 5 is a .yi'ew" from the obverse side of the same lamina; Fig. 6 is a view of the lamina looking from above Fig. 5. Fig. 7 is an enlarged section taken on line 7+7 of Fig. 8; and Fig. 8 is an enlarged section taken on line'8-8 of Fig. 3.

In all of the views the same reference characters indicate similar parts. For the purpose of disclosure, I have illus-- trated a quadrupolar dynamo, but it Will become obvious, from the following descrip: tion, that my invention is applicable to a dynamo of any character wherein confronting field poles are located on opposite sides o f the axis of a revolving armature.

One of the salient features of my invention consists in the assembling and securing which the of the casing, Iprovide a bearing 16, for the armature shaft, 17.- At this end, the commutator of the machineis located, and is normally inclosed by 18, secured on each side of the frame 'by a separable hinge 19, having a. removable either. side of the casin top 18 may be swun posed hinge, and w en both pins are in place, 'the top is firmly held in proper rela tion.. Therefore, to obtain access to the com: mutator, it is only necessary to remove one of the pins 20.- The rear end of the casing, 10, is provided with a large opening, sur rounded by flanges, 21, through which "the pole shoe structure'and the armature may poles, constitute a dust proof casing, in-

armatureis rotated. At one end the hinged cover,

tible material is expensive, and when such field magnet coils by hand, in the spaces 7 be contained; this is cost of production and pintle or pin, 20. When the pins, 20, on are removed, the on the opppsitely disthe casing. A bearing support, in the shape of a disk, 22, fits firmly into this opening and provides a bearing for the pulley end of the shaft, 17.

Field coils, 11, 12, 13', and 14, may be wound upon forms, suitably insulated, and

slipped over the ends of the respective inwardly projecting pole pieces within the casing. These field coils may be held in place by means of the pole shoe ring, which.

is inserted between the respective pole pieces and projects circumferentially beyond each of the polar ends of the magnets, affording ample, firm, support foreach of the field coils, and preventing them from being displaced from the respective magnet poles which they surround. The pole shoe ring is made up of a series of crescent-shaped laminae, such as-showgi in detail in Figs. 4 and 5, and indicated generally at 25. Each of the pieces 25 is perforated as at 26 for the insertion of a bolt, 27. Each of the pieces, 25, is also provided with indentations, 28 and 28. These indentations or depressions are shown enlarged in Fig. 8. It is obvious that they nest one within the otherwhen the'pieces'are' placed on the bolts 27, and pressed together in the process of assembling them. By this means they are held in register so as to provide a smooth polar surface between the rings of which they constitute a part.

The sections, '25, are punched from sheet metal of proper material and highly permeable to magnetism. The perforations, as at 26, as shown in Figs. 4c, 5 and 6, and the indentations or deflected portions, 28 and 28, are pressed in the sides of each of the sections. To prevent magnetic and electric longitudinal continuity, the side surfaces of the pieces, 25, may be painted or coated with any suitable material well known in the art for this purpose.

End rings, 29 and 30, preferably of brass,

- or some other diamagnetic material, form a part of the frame upon which the segments 25 are to be supported. Each of the rings, 29 and 30, are perforated for the reception of the bolts, 27, at as many points within their circumference as there are field poles in the dynamo- The segments, 25, are then threaded upon the bolts, 27, and the deflected indentations, 28 and 28, nest within each other as shown clearly in Fig. 7 whereby they mutually hold the respective pieces, 25, and prevent them from shifting laterally or around the axis of the bolt by which they are supported.

One or more strengthening rings, 3l,pref- Inents, 25, have been inserted upon the respective bolts, 27, to substantially or somewhat more than equal the longitudinal extent of the pole pieces of the armature, the segments are compressed tightly together, and the rods, 27, upon which they are strung are headed over at their ends, as at 32, as clearly shown in Fig. 7. By this construction, I provide a laminated pole shoe for each of the magnets of my dynamo electric machine, and retain them in their proper relation with reference to the respective magnetic poles and secure them together in such mannerthat they are as a unit bodily removable from the dynamo.

Any means, such as a pin, screw, or the like, may be employed for preventing the pole shoe structure from shifting-in-regard to the respective poles, when placed in the proper position within the dynamo but in practice, I have found that it is sufiicient merely to grind the casing to a very slight internal taper for engagement of the pole shoe structure. The unit structure of laminated pole shoes, not only adds to the efficiency of theapparatus by preventing loss due to hysteresis and consequent heat, but it is' 'a convenient and cheap methodof constructing the parts, as the inner magneticsurface, provided by the respective pole shoes, is true and proper and definite in diameter, so that subsequent boring out of the pole shoe structure is unnecessary.

I have found from experience that the eX- tension of the magnetic polar surface of the field magnet accomplished by the pole shoes,

contributes to the increase output of the pended claim.

'What I claim is:

The combination, in a dynamo-electric machine having a plurality of radially disposed magnetic poles and coils around said poles, of a pole-shoe structure comprising opposite unbroken end rings of suitablediamagnetic material, a bolt passing through a perforation in each ring adjacent the center of each said magnetic pole, a series of poleshoe laminae upon each said bolt, each laminac having deflected portions for interfitting with corresponding deflected portions of adjacent laminae to maintain the series of laminae upon each bolt in perfect alinement, and an unbroken strengthening ring of diamagnctic material, having a perforationad- Copies of this patent may be obtained tor five cents each,

3 Washington, D. 0.

ening ring lying inh I In testimony whereof I hereunto set In and in the presence of two witnesses.

VINCENT G. APPLE.

In the presence'of 1. SNYDER,

by addressing the "Comnulslon'er 01' Patent I 

